/Engine/Plugins/Online/OnlineSubsystemUtils/Source/OnlineSubsystemUtils/Public/PartyBeaconHost.h
Attempts to add a party reservation to the beacon
add attempt result
virtual [EPartyReservationResult::Type](API\Plugins\OnlineSubsystemUtils\EPartyReservationResult__Type) AddPartyReservation ( const [FPartyReservation](API\Plugins\OnlineSubsystemUtils\FPartyReservation) & ReservationRequest )